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Book of Evil

Slots Video Slots Fantasy Horror Vampires Book Demon

High-volatility horror Book slot with dual-purpose Book symbols

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

94%

return to player

Volatility

High volatility

variance

Max win

5,000×

top multiplier

Min bet

$0.20

per spin

Reels

10 lines

Player rating

4.5 ★

3 votes

DEMO Play free, no signup

SpinOn

Embed on your site

4.5 / 5

3 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP6/10

RTP 94% → 6.0/10

Volatility9/10

high → 9.0/10

Win Potential7.4/10

x5000.00 (5000×) → 7.4/10

Features6/10

9 features → 6.0/10

Game Mechanics4.2/10

f=9 r=5 p=10 → 4.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility6/10

0.2–50 (×250) → 6.0/10

Provider Reputation6.3/10

provider avg 6.3 → 6.3/10

Popularity5/10

synthetic proxy → 5.0/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 61 — Book of Evil by SpinOn

https://slotranker.com/spinon/book-of-evil#score

How to cite

Slot Summary

A 5x3 grid with 10 paylines gives Book of Evil a conventional Book format, but its 94% RTP and high volatility make the risk profile unusually severe. SpinOn ties the Book symbol to both Wild Symbol and Scatter Symbol duties, while Expanding Symbols can affect the base game as well as Free Spins. The x5000.00 ceiling therefore depends on a familiar feature path presented through Demon, Horror, and Vampires imagery.

How It Plays

Winning combinations form from left to right across 10 paylines on the 5x3 grid. The Book substitutes for ordinary symbols while also counting toward the feature trigger.

A random symbol may expand during the base game when doing so improves a result. This gives ordinary spins access to the title's central transformation mechanic.

Theme & Atmosphere

Book of Evil places the familiar Book format inside a Horror and Fantasy setting populated by Demon and Vampires figures rather than ancient explorers.

The darker subject matter matches the high-volatility profile, while the Book itself serves as the visual link between the setting and the principal game rules.

Fantasy Horror Vampires Book Demon

Features & Win Potential

The Book Of... feature combines Wild Symbol and Scatter Symbol functions in one icon. Three or more qualifying Books activate Free Spins and award the associated scatter result.

Expanding Symbols are not restricted to the bonus. A randomly chosen symbol can expand in the base game, while the selected bonus symbol remains eligible throughout Free Spins.

High volatility Free Spins Scatter Symbol Wild Symbol Book Of...Bonus Buy Additional Free Spins Expanding Symbols RTP range

Bonus & Free Spins

Free Spins begin with 10 spins after 3, 4, or 5 Scatter Symbols land. One ordinary symbol is selected to act as the Expanding Symbol for the round.

Additional Free Spins are awarded when enough Book symbols return during the round. Bonus Buy provides direct access for x100 the chosen stake.

Spec sheet

Book of Evil at a glance.

Identity

Slot nameBook of Evil

StudioSpinOn

Released9/18/2024

Math

SlotRanker Score61

RTP94%

VolatilityHigh volatility

Max win5,000×

Bet range$0.20 – $50.00

Player rating4.5 / 5 · 3 votes

Format

Reels5

Paylines10

Layout5x3

Features

Themes

Expected average based on this slot's 94% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$4.80

Cost per session$4.80

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Book of Evil? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: High

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (High). The model is calibrated so the average return equals this slot's published RTP (94.00%), with wins capped at its top multiplier (5,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Book of Evil

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Compare Book of Evil with other games

	Book of Evil Score 61This game	Blood Suckers Megaways Score 83	Baron Bloodmore Score 83	Wild Witches Score 82	Empress of the Shadows Score 80
Identity
Studio	SpinOn	Red Tiger Gaming	Thunderkick	Popiplay	Bullshark Games
Released	9/18/2024	1/26/2023	5/12/2021	2/20/2024	9/24/2024
Math
RTP	94%	97.66%	96.15%	97.42%	96.31%
Volatility	High volatility	High volatility	High volatility	High volatility	Medium volatility
Max win	5,000×	20,521×	25,000×	10,100×	12,000×
Format
Reels	5	6	5	5	5
Layout	5x3	6x7	5x3	5x3	5x3
Paylines	10	0	25	15	20
Min bet	0.2	—	0.1	0.1	0.1
Max bet	50	4	100	20	100
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	✓	✓	—	✓
Bonus game	—	—	✓	—	—
Respins	—	—	✓	—	—

Every number is shown as a delta against Book of Evil.

Comparing against

Book of Evil

SpinOn

RTP

94%

Max win

5,000×

Score

Blood Suckers Megaways

+ Multiplier+ Bonus Game+ Respins

Empress of the Shadows

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